CraftSaving is a online store that sells various Diamond Painting kits and accessories. From what I can see, they are in China, but if the goods are sent directly from China or not, I can not answer as I have unfortunately not found any information about this.
They have many different paintings and they are all pretty cheap, but remember to look at what size the paintings are. I saw some that had a lot of details and did not feel big enough for it. They also have a lot of different things that are not paintings that are Diamond Painting. For example, they have cases for glasses, bags, key chains, stickers and LED lights.
Standard delivery is between 15-25 days, and express delivery is between 7-10 days. Shipping costs are calculated at checkout, so I do not know what it really is. But I ordered three things and had to pay $8.99 in shipping. They offer free shipping on orders over $199. You can pay with PayPal or credit card.
You can find the store here: CraftSaving.